Thermal insulation structure of reactor pressure vessel and reactor pit water injection system

Abstract

The invention discloses a heat preservation structure of a reactor pressure vessel and a reactor pit water injection system. The heat preservation structure of the reactor pressure vessel comprises a heat preservation assembly which is provided with a first mounting part and a second mounting part; the first supporting piece is suitable for being connected with a supporting ring arranged on the periphery of the reactor pit, and the first supporting piece is configured to bear the first mounting part when the heat preservation assembly stretches into the reactor pit in the preset direction; and the second supporting piece is suitable for being arranged in the reactor pit, and the second supporting piece is configured to center the heat preservation assembly when the heat preservation assembly stretches into the reactor pit in the preset direction and limit the second mounting part in the circumferential direction of the heat preservation assembly. The heat preservation assembly, the first mounting part and the second mounting part are preassembled into a whole; hoisting and positioning installation work is integrated in one step, so that side wall welding and adjusting work possibly needed in a traditional method is omitted; the construction difficulty can be reduced, the construction time is shortened, and the overall construction efficiency is improved; therefore, the installation and adjustment period in a pile pit is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power equipment, and in particular to a heat preservation structure of a reactor pressure vessel and a reactor pit water injection system. Background Art

[0002] In the related art, the insulation fixing method of the reactor pressure vessel is as follows: in the barrel section, the insulation layer is fixed by the support members fixed on the embedded parts of the reactor pit, wherein the flow channel lining is connected and fixed to the lateral support members by bolts, and the lateral support members are fixed to the embedded parts of the reactor pit by welding; in the lower head section, the insulation layer is fixed by the bottom bracket, wherein the flow channel lining is connected and fixed to the bottom bracket by bolts, and the bottom bracket is welded to the embedded plate at the bottom of the reactor pit. For the support scheme of the insulation layer of the barrel section, it is necessary to weld and adjust the lateral insulation support members of the reactor pressure vessel after the ring plate is embedded in the reactor pit, and finally install and adjust the flow channel lining and the insulation layer block. Due to the large number of lateral support members of the insulation layer, high installation precision requirements, and narrow operating space, the installation period of the insulation layer in the reactor pit is about more than 6 months.

[0003] Especially after adopting the open-top construction method, the installation of RPV (reactor pressure vessel) insulation components is in the critical path of construction, and the difficulty of risk prevention and control in terms of project progress and quality will be more prominent. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a heat preservation structure of a reactor pressure vessel, which can.

[0005] The present invention also provides a reactor pit water injection system having the thermal insulation structure of the reactor pressure vessel.

[0006] According to the insulation structure of the reactor pressure vessel of the first aspect embodiment of the present invention, the insulation structure of the reactor pressure vessel includes: an insulation component, having an insulation cavity for accommodating the reactor pressure vessel; the insulation component is provided with a first mounting portion and a second mounting portion; a first support member, suitable for being connected to a supporting ring arranged at the periphery of a stack pit, the first support member being configured to support the first mounting portion when the insulation component extends into the stack pit along a preset direction; a second support member, suitable for being arranged in the stack pit, the second support member being configured to center the insulation component when the insulation component extends into the stack pit along a preset direction, and to limit the second mounting portion along the circumference of the insulation component.

[0007] The insulation structure of the reactor pressure vessel according to the embodiment of the present invention has at least the following beneficial effects: the insulation component, the first mounting part and the second mounting part are pre-installed as a whole; and the lifting and positioning installation work are integrated into one step. That is, as the insulation component extends into the stack pit along the preset direction, the first mounting part automatically cooperates with the first support member, and the second mounting part also automatically cooperates with the second support member. The second support member also has a centering function, that is, in the process of the insulation component extending into the stack pit, the second support member can ensure that the insulation component is centered in the correct direction, determine that the installation position of the insulation component is unique, avoid subsequent adjustment work, and improve installation accuracy. The side wall welding and adjustment work that may be required in the traditional method is eliminated. It can reduce the construction difficulty, reduce the construction time, and improve the overall construction efficiency; thereby shortening the installation and adjustment period in the stack pit.

[0008] According to some embodiments of the present invention, the bottom of the first mounting portion forms a first plane; the first supporting member has a bearing plane, and when the thermal insulation component extends into the stack pit, the bearing plane contacts the first plane to support the thermal insulation component.

[0009] According to some embodiments of the present invention, it also includes an adjusting member; the first mounting portion is provided with a threaded hole, and the adjusting member is threadedly connected to the threaded hole; the adjusting member can be rotated relative to the first mounting portion until it is pressed against the supporting ring so that a gap exists between the first plane and the bearing plane.

[0010] According to some embodiments of the present invention, the first support member has a guide groove extending radially along the thermal insulation component, and the adjustment member passes through the guide groove; when there is a gap between the first plane and the bearing plane, the first support member can move radially along the thermal insulation component.

[0011] According to some embodiments of the present invention, one of the second mounting portion and the second supporting member forms a limiting groove extending radially along the thermal insulation component, and the other includes a limiting plate inserted into the limiting groove.

[0012] According to some embodiments of the present invention, the second mounting portion is provided with a plurality of the limit grooves arranged at intervals along the circumference of the insulation component; the second support member includes a plurality of limit plates, the number of the limit plates is consistent with the number of the limit grooves, and the limit plates are inserted into the limit grooves one by one.

[0013] According to some embodiments of the present invention, the second support member also includes a support seat, one end of the support seat is used to connect to the bottom wall of the pile pit, and the other end of the support seat is provided with an annular plate; the annular plate has the limiting groove; or the limiting plate is connected to the annular plate.

[0014] According to some embodiments of the present invention, the insulation component has an installation state and a working state. When the insulation component is in the installation state, the first mounting portion is in surface contact with the first support member; when the insulation component is in the working state, the first mounting portion can move radially of the insulation component relative to the second mounting portion to adapt to the radial thermal expansion of the insulation component.

[0015] According to some embodiments of the present invention, the first support member has a mounting groove extending along the radial direction of the insulation component, a portion of the first mounting portion is disposed in the mounting groove, and the first mounting portion is limited circumferentially between two side walls of the mounting groove; the bottom surface of the first mounting portion contacts the bottom wall of the mounting groove, and the first mounting portion can move radially along the insulation component in the mounting groove to adapt to the radial thermal expansion of the insulation component.

[0016] According to some embodiments of the present invention, the first support member includes a pad and a cover plate, the pad is provided with the installation groove, and the cover plate is detachably connected to the pad; the cover plate has a first limiting portion, the first limiting portion is located at the notch of the installation groove, and a portion of the first installation portion is limited between the first limiting portion and the bottom wall of the installation groove; and / or the cover plate has a second limiting portion, the second limiting portion is provided at one end of the installation groove facing the insulation component, and when the insulation component is in the installation state, the second limiting portion stops the first installation portion.

[0017] According to some embodiments of the present invention, the first mounting portion includes a bottom plate and a rib plate, wherein the rib plate connects the top surface of the bottom plate and the side wall of the thermal insulation component; the bottom plate is disposed in the mounting groove, and the bottom surface of the bottom plate contacts the bottom wall of the mounting groove.

[0018] According to some embodiments of the present invention, the second mounting portion cooperates with the slot of the second support member; when the insulation component is in working state, the second mounting portion can move axially relative to the second support member along the insulation component until the second mounting portion abuts against the second support member to adapt to the axial thermal expansion of the insulation component.

[0019] According to some embodiments of the present invention, the second mounting portion is arranged at the bottom of the insulation component, and the second mounting portion has a limiting groove extending radially along the insulation component; the second support member includes a limiting plate, and the first end of the limiting plate is inserted into the limiting groove; when the insulation component is in an installed state, there is a gap between the first end of the limiting plate and the bottom wall of the limiting groove; when the insulation component is in a working state, the first end of the limiting plate abuts against the bottom wall of the limiting groove to support the insulation component.

[0020] According to some embodiments of the present invention, the number of the first support members and the number of the second support members are the same, and the first support members and the second support members are aligned along the axial direction of the heat preservation assembly.

[0021] According to some embodiments of the present invention, the thermal insulation assembly includes a flow guide tube and a thermal insulation layer arranged outside the flow guide tube, and the first mounting portion and the second mounting portion are both connected to the flow guide tube.

[0022] According to the reactor pit water injection system of the second aspect embodiment of the present invention, the reactor pit water injection system includes a reactor pit, a support ring and the insulation structure of the reactor pressure vessel as described in the first aspect, the support ring is arranged on the outside of the reactor pit, the first support member is connected to the support ring, and the second support member is arranged in the reactor pit.

[0023] The pile pit water injection system according to the embodiment of the present invention has at least the following beneficial effects: the insulation component, the first installation part and the second installation part are pre-installed as a whole; the lifting and positioning installation work are integrated into one step, eliminating the side wall welding and adjustment work that may be required in the traditional method; it can reduce the construction difficulty, reduce the construction time, and improve the overall construction efficiency; thereby shortening the installation and adjustment period in the pile pit.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 It is a schematic structural diagram of a pile pit water injection system according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A partial enlarged schematic diagram of the middle A area;

[0028] Figure 3 Schematic diagram of the matching relationship between the first support member and the support ring in an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the positional relationship between the thermal insulation component and the supporting structure in an embodiment of the present invention;

[0030] Figure 5 for Figure 4 A partial enlarged schematic diagram of the middle B area;

[0031] Figure 6 It is a structural schematic diagram of a pad in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of the cover plate in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of the first installation part in an embodiment of the present invention;

[0034] Fig. 9 Schematic diagram of the matching relationship between the second mounting portion and the second supporting member in an embodiment of the present invention;

[0035] Fig.10 for Fig. 9 A partial enlarged schematic diagram of the middle C area;

[0036] Fig.11 Schematic diagram of the distribution positions of the first mounting portion and the first supporting seat in an embodiment of the present invention.

[0037] Reference numerals:

[0038] 1000. Pit water injection system;

[0039] 100. Thermal insulation structure;

[0040] 10. first mounting portion; 11. first plane; 12. threaded hole; 13. bottom plate; 14. rib plate;

[0041] 20. Second mounting portion; 21. Limiting groove;

[0042] 30. first support member; 31. bearing plane; 32. guide groove; 33. mounting groove; 34. pad; 35. limiting boss; 36. cover plate; 361. first limiting portion; 362. second limiting portion;

[0043] 40. Second support member; 41. Limiting plate; 411. Horizontal plate; 412. Vertical plate; 42. Support seat; 421. Support leg; 422. Adjustable support section; 423. Reinforcement rod; 43. Annular plate;

[0044] 50. Adjustment parts;

[0045] 200, thermal insulation component; 201, guide tube; 202, thermal insulation layer; 203, thermal insulation cavity;

[0046] 300. Pile pit;

[0047] 400. Reactor pressure vessel;

[0048] 500. Support ring. DETAILED DESCRIPTION

[0049] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0050] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0052] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0053] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0054] In a first aspect, the present application provides a thermal insulation structure of a reactor pressure vessel (hereinafter referred to as the thermal insulation structure), such as Figures 1 to 3 As shown, the thermal insulation structure 100 is disposed in the reactor pit 300 and is used to install the reactor pressure vessel 400 .

[0055] like Figures 1 to 3As shown, the insulation structure 100 includes an insulation component 200, a first mounting portion 10, a second mounting portion 20, a first support member 30 and a second support member 40. The first mounting portion 10, the second mounting portion 20, the first support member 30 and the second support member 40 together constitute a supporting structure for stably installing the insulation component in the stack pit 300.

[0056] The insulation assembly 200 includes a guide tube 201 and an insulation layer 202. The guide tube 201 has an insulation cavity 203, and the insulation cavity 203 is used to accommodate the reactor pressure vessel 400. The guide tube 201 is usually designed to be cylindrical or similar in shape to adapt to the shape of the reactor pressure vessel 400. The main function of the guide tube 201 is to guide fluid, such as coolant, to flow around the reactor pressure vessel 400 to ensure effective heat transfer and heat dissipation. The material of the guide tube 201 is usually selected to be able to withstand high temperature, high pressure and radiation environment to ensure its long-term stable operation.

[0057] The insulation layer 202 is arranged outside the guide tube 201, and its main function is to reduce heat loss and improve the insulation performance of the reactor pressure vessel 400. The insulation layer 202 is usually composed of multiple layers of materials, including heat insulation materials, reflective materials and protective layers, etc., to provide better insulation effect. The material and thickness of the insulation layer 202 are usually selected and designed according to the operating conditions and insulation requirements of the reactor.

[0058] In some embodiments, Figures 1 to 3 As shown, the first mounting portion 10 and the second mounting portion 20 are both connected to the insulation component 200, the first support member 30 is connected to the support ring 500 arranged on the periphery of the stacking pit 300, and the first support member 30 is configured to support the first mounting portion 10 when the insulation component 200 extends into the stacking pit 300 along a preset direction; the second support member 40 is arranged in the stacking pit 300, and the second support member 40 is configured to center the insulation component 200 when the insulation component 200 extends into the stacking pit 300 along a preset direction, and to limit the second mounting portion 20 along the circumference of the insulation component 200.

[0059] In this embodiment, the insulation component 200, the first mounting part 10 and the second mounting part 20 are pre-installed as a whole, which is convenient for manufacturing and transportation; more importantly, they can be operated as a unit during the hoisting process, simplifying the installation process. In this embodiment, the hoisting and positioning installation work are integrated into one step, that is, as the insulation component 200 extends into the stacking pit 300 along the preset direction, the first mounting part 10 automatically cooperates with the first support member 30, and the second mounting part 20 also automatically cooperates with the second support member 40. The second support member 40 also has a centering function, that is, in the process of the insulation component 200 extending into the stacking pit 300, the second support member 40 can ensure that the insulation component 200 is centered in the correct direction, determine that the installation position of the insulation component 200 is unique, avoid subsequent adjustment work, and improve installation accuracy. The side wall welding and adjustment work that may be required in the traditional method are omitted, which can reduce the construction difficulty, reduce the construction time, and improve the overall construction efficiency, thereby shortening the installation and adjustment period in the stacking pit 300.

[0060] In some embodiments, Figure 3 and Figure 4 As shown, the first mounting portion 10 and the second mounting portion 20 are both connected to the guide tube 201 to improve the connection reliability between the first mounting portion 10, the second mounting portion 20 and the guide tube 201, so that the insulation component 200 can be stably installed on the first support member 30 and the second support member 40.

[0061] The first mounting portion 10 is usually arranged near the upper end of the insulation component 200, and the first mounting portion 10 and the first support member 30 cooperate to provide longitudinal suspension support for the insulation component 200; the second mounting portion 20 is usually arranged near the lower end of the insulation component 200, and cooperates with the second support member 40 arranged in the stacking pit 300 to provide bottom bearing support and centering function for the insulation component 200, thereby forming an upper hanging and lower supporting structure.

[0062] It should be noted that when the reactor pressure vessel 400 is working, the insulation assembly 200 will be heated to generate radial thermal expansion and axial thermal expansion. The first mounting portion 10 cooperates with the first support member 30, and the second mounting portion 20 cooperates with the second support member 40. While achieving the positioning and installation of the insulation assembly 200, it is also necessary to be able to adapt to the radial thermal expansion and axial thermal expansion. For the convenience of description, the state of the insulation assembly 200 when the reactor pressure vessel 400 is not working is defined as the installation state, and the state of the insulation assembly 200 when the reactor pressure vessel 400 is working is defined as the working state.

[0063] The cooperation between the first mounting portion 10 and the first supporting member 30 is described in detail below.

[0064] like Figure 2 and Figure 4As shown, the first mounting portion 10 and the first support member 30 can be in surface contact, and the first mounting portion 10 and the first support member 30 have a certain contact area, which can provide greater supporting force for the insulation component 200 and ensure that the insulation component 200 remains stable under the action of gravity and other external forces.

[0065] At the same time, in order to adapt to the radial thermal expansion of the insulation assembly 200 in operation, the first mounting portion 10 is designed to be radially displaced relative to the first support member 30. This improves the adaptability and reliability of the insulation assembly 200 and ensures the safe operation of the reactor pressure vessel 400.

[0066] Specifically, Figures 4 to 8 As shown, the bottom of the first mounting portion 10 forms a first plane 11, and the first support is combined with a bearing plane 31. The bearing plane 31 cooperates with the first plane 11 to achieve surface contact. While supporting the insulation component 200, it can adapt to the radial thermal expansion generated by the insulation component 200 in the working state.

[0067] The first plane 11 and the bearing plane 31 may be coated with a wear-resistant coating, thereby improving the wear resistance of the contact surface between the first mounting portion 10 and the first support member 30, effectively reducing the wear caused by radial displacement of the first plane 11 and the bearing plane 31, and maintaining the flatness and stability of the contact surface. The wear-resistant coating material may be a ceramic layer, a silicon carbide layer, a silicon nitride layer, a metal alloy layer, etc.

[0068] In other embodiments, balls may be arranged on the support plane, and the first plane 11 contacts the balls. Ball bearing can significantly reduce the friction resistance between the first plane 11 and the load-bearing plane 31, and the ball bearing replaces the sliding friction with the rolling friction, thereby reducing the friction and wear, and improving the durability of the first support member 30.

[0069] The first mounting portion 10 may be an integrated structure disposed outside the heat preservation component 200 , or may be a plurality of independent structures spaced apart along the outer circumference of the heat preservation component 200 , which is not limited in this embodiment.

[0070] The first support member 30 can be arranged in the annular structure of the support ring 500, or it can be an independent structure arranged on the top surface of the support ring 500 along the outer periphery of the insulation component 200; the first support member 30 can be a part of the support ring 500, and the first support member 30 can also be independent of the support ring, which is not limited in this embodiment.

[0071] In order to ensure installation accuracy, Figure 2 , Figure 4 and Figure 5As shown, when the step of hoisting the insulation assembly 200 into the pit 300 is performed, the first support member 30 and the support ring 500 are not fixed. The insulation assembly 200 is slowly placed into the pit 300 by using the hoisting equipment, and the second mounting portion 20 is centered by the second support member 40 to ensure that the insulation assembly 200 is in the correct position in both the horizontal and vertical directions. After determining the position of the insulation assembly 200, the first support member 30 is adaptively adjusted according to the centering result, and specifically, the height, inclination angle or horizontal position of the first support member 30 can be fine-tuned to ensure that it is closely fitted with the first mounting portion 10 of the insulation assembly 200 and provides stable support. After completing the adaptive adjustment of the first support member 30, the first support member 30 is fixed to the support ring 500. Prevent the insulation assembly 200 from being displaced due to vibration or external force during subsequent operation. The fixing method can be bolt connection, welding or other reliable connection methods, depending on the design requirements and working environment of the reactor pressure vessel 400.

[0072] In some embodiments, the first mounting portion 10 is provided with a threaded hole 12 extending in the vertical direction, and the heat preservation structure 100 further comprises an adjusting member 50, which is threadedly connected to the threaded hole 12 of the first mounting portion 10, and the adjusting member 50 can rotate relative to the first mounting portion 10. When the first support member 30 is adaptively adjusted, the adjusting member 50 can form a temporary support for the heat preservation assembly 200; specifically, by rotating the adjusting member 50, the end of the adjusting member 50 is pressed against the supporting ring 500 to form a temporary support, so that there is a gap between the first plane 11 and the bearing plane 31, so as to facilitate the placement and placement of the first support member 30, and to perform adaptive adjustment on the first support member 30. After the adjustment of the first support member 30 is completed, the adjusting member 50 is rotated relative to the first support portion again until there is a space between the end of the adjusting member 50 and the supporting ring 500; at this time, the first plane 11 is in contact with the bearing plane 31 to form a support.

[0073] The adjusting member 50 has an end suitable for screwing, for example, a slot, a cross slot or a hexagonal slot is opened on the end; after the first supporting member 30 is adaptively adjusted and the first supporting member 30 is fixed to the supporting ring 500, the adjusting member 50 can be removed.

[0074] Based on the above embodiments, Figures 4 to 7As shown, the first support member 30 has a guide groove 32 extending in the radial direction of the heat preservation assembly 200, and the adjusting member 50 passes through the guide groove 32; when there is a gap between the first plane 11 and the bearing plane 31, the first support member 30 can move in the radial direction of the heat preservation assembly 200. The guide groove 32 is used for the adjusting member 50 to pass through when the first support member 30 moves. The cooperation between the guide groove 32 and the adjusting member 50 defines the moving path of the first support member 30, prevents the first support member 30 from deviating from the predetermined direction during the movement, and improves the accuracy and stability of the installation of the first support member 30.

[0075] The guide groove 32 forms an opening on the side of the first support member 30 facing the heat preservation assembly 200 , thereby allowing the adjustment member 50 to enter or escape from the guide groove 32 through the opening, thereby simplifying the process of taking and placing the first support member 30 .

[0076] In some embodiments, the first support member 30 has a mounting groove 33 extending in the radial direction of the thermal insulation assembly 200, and a portion of the first mounting portion 10 is disposed in the mounting groove 33. The first mounting portion 10 can move in the mounting groove 33 in the radial direction of the thermal insulation assembly 200 to adapt to the radial thermal expansion of the thermal insulation assembly 200. The bottom surface of the first mounting portion 10 contacts the bottom wall of the mounting groove 33, forming a stable support structure, while improving the smoothness of the radial movement of the first mounting portion 10 in the mounting groove 33.

[0077] Part of the first mounting portion 10 is disposed in the mounting groove 33 , and the first mounting portion 10 is limited between the two side walls of the mounting groove 33 along the circumferential direction, so as to prevent the first mounting portion 10 from deviating from the predetermined radial direction during movement.

[0078] like Figures 4 to 7 As shown, the first support member 30 includes a backing plate 34 , which is provided with a mounting groove 33 , and a guide groove 32 can be formed on the bottom wall of the mounting groove 33 , and both the mounting groove 33 and the guide groove 32 extend radially along the heat preservation assembly 200 .

[0079] The mounting groove 33 can be formed by directly cutting a groove on the top surface of the pad 34, or two limiting bosses 35 can be provided on the top surface of the pad 34, and the mounting groove 33 is formed between the two limiting bosses 35. Thus, the pad 34 can be temporarily supported by the adjusting member 50 to realize the placement and removal of the pad 34, and the adaptability adjustment of the first supporting member 30 is mainly to fine-tune the bottom surface of the mounting groove 33.

[0080] The first support member 30 also includes a cover plate 36, which is detachably connected to the pad plate 34; after adaptively adjusting the first support member 30, the first support member 30 is reinstalled, and when the first support member 30 is matched with the first mounting portion 10 again, the cover plate 36 and the pad plate 34 are assembled to limit the first mounting portion 10.

[0081] The cover plate 36 may have a first limiting portion 361, which is located at the slot of the mounting groove 33. Part of the first mounting portion 10 is limited between the first limiting portion 361 and the bottom wall of the mounting groove 33, thereby limiting the axial direction of the first mounting portion 10. The first mounting portion 10 can prevent the insulation component 200 from axially jumping in a vibration environment.

[0082] When the heat preservation assembly 200 is in the installed state, the first mounting portion 10 is supported on the bottom wall of the mounting groove 33, and a certain gap may exist between the first mounting portion 10 and the first position limiting portion 361. When the heat preservation assembly 200 is in the working state, the first mounting portion 10 may move to be tightly against the first position limiting portion 361 due to the influence of the axial thermal expansion.

[0083] The cover plate 36 has a second position-limiting portion 362, and the second position-limiting portion 362 is arranged at one end of the mounting groove 33 facing the heat preservation assembly 200. After the first support member 30 is adaptively adjusted, the backing plate 34 is inserted from the gap between the first mounting portion 10 and the support ring 500, and then the cover plate 36 is assembled to the backing plate 34, so that the second position-limiting portion 362 limits and stops the first mounting portion 10, thereby determining the installation position of the backing plate 34. When the heat preservation assembly 200 is in the installed state, the second position-limiting portion 362 stops the first mounting portion 10 to prevent the heat preservation assembly 200 from shaking. When the heat preservation assembly 200 is in the working state, the first mounting portion 10 can move in the direction of increasing diameter to adapt to the radial thermal expansion.

[0084] The cover plate 36 is L-shaped, and the first edge of the L-shaped cover plate 36 is detachably connected to the limiting protrusion by fasteners such as bolts. The first edge of the L-shaped cover plate 36 protrudes from the limiting protrusion toward the installation groove 33 to form a first limiting portion 361, and the second edge forms a second limiting portion 362, which is at least partially located at one end of the installation groove 33 toward the insulation component 200 to form a second limiting portion 362.

[0085] The backing plate 34 is provided with mounting holes on the opposite sides of the two limiting protrusions, that is, the portion of the backing plate 34 used for the connection with the support ring 500 is completely exposed from the cover plate 36 to avoid obstruction, which is conducive to locking and fixing the backing plate 34 and the support ring by fasteners such as bolts.

[0086] In some embodiments, Figure 4 , Figure 5 and Figure 8As shown, the first mounting portion 10 includes a bottom plate 13 and a rib plate 14, the bottom plate 13 is connected to the side wall of the heat preservation assembly 200, and the rib plate 14 connects the top surface of the bottom plate 13 and the side wall of the heat preservation assembly 200; a certain gap can be formed between the bottom plate 13 and the outer side of the heat preservation assembly 200, the bottom plate 13 is arranged in the mounting groove 33, and the bottom surface of the bottom plate 13 forms a first plane 11 in contact with the bottom wall of the mounting groove 33. One end of the bottom plate 13 close to the heat preservation assembly 200 is used to contact and limit with the second limit portion 362.

[0087] Both sides of the bottom plate 13 have portions exposed from the ribs 14 , and the first limiting portion 361 cooperates with the bottom wall of the mounting groove 33 to limit the portion of the bottom plate 13 exposed from the old ribs 14 .

[0088] The number of ribs 14 can be 2, 3 or even more, so as to improve the connection strength of the bottom plate 13, the ribs 14 and the insulation assembly 200. When there are two ribs 14, a threaded hole 12 is provided on the bottom plate 13, and the threaded hole 12 is located between the two ribs 14, so that when the bolts are adjusted for temporary support, the force can be dispersed to avoid bending and deformation of the ribs 14 or the bottom plate 13.

[0089] The cooperation between the second mounting portion 20 and the second supporting member 40 is described in detail below.

[0090] like Figure 4 , Fig. 9 and Fig.10 As shown, the second mounting portion 20 is engaged with the second support member 40 by a slot, that is, one of the second mounting portion 20 and the second support member 40 is formed with a limiting slot 21 extending radially along the heat preservation assembly 200, and the other includes a limiting plate 41. When the heat preservation assembly 200 is hoisted into the pile pit 300, it is only necessary to align the limiting plate 41 and insert it into the limiting slot 21. The heat preservation assembly 200 is quickly aligned, and the movement of the heat preservation assembly 200 in the circumferential direction is effectively limited by the close cooperation between the limiting slot 21 and the limiting plate 41. Due to the simultaneous existence of centering and circumferential limiting, the heat preservation assembly 200 cannot move in the horizontal direction, and can only adapt to the overall expansion in the direction of increasing diameter when the heat preservation assembly 200 is in the working state.

[0091] For example, the second mounting portion 20 is provided with a plurality of spaced apart limit grooves 21 along the circumference of the thermal insulation component 200; the second support member 40 includes a plurality of limit plates 41, the number of the limit plates 41 is consistent with the number of the limit grooves 21, and the limit plates 41 are inserted into the limit grooves 21 one by one.

[0092] When hoisting the insulation assembly 200 into the stacking pit 300, it is necessary to align the limiting plate 41 on the second support member 40 with the limiting groove 21 on the second mounting portion 20, and simultaneously insert the limiting plate 41 into the limiting groove 21 to avoid jamming or misalignment.

[0093] Since the limiting grooves 21 and the limiting plates 41 are distributed in the circumferential direction, when all the limiting plates 41 are inserted into the limiting grooves 21, the heat preservation assembly 200 will be firmly fixed on the second support member 40 and maintain a centered state. This can not only prevent the heat preservation assembly 200 from moving in the horizontal direction, but also adapt to the radial thermal expansion of the heat preservation assembly 200 in the working state.

[0094] In other embodiments, a limiting plate 41 may be provided on the second mounting portion 20 , and a limiting groove 21 may be provided on the second supporting member 40 , which is not limited in this embodiment.

[0095] The following description will be made by taking the second mounting portion 20 being provided with the limiting groove 21 and the second supporting member 40 being provided with the limiting plate 41 as an example.

[0096] like Figure 4 , Fig. 9 and Fig.10 As shown, the second support member 40 also includes a support seat 42, one end of the support seat 42 is used to connect with the bottom wall of the pit 300, and the other end of the support seat 42 is provided with an annular plate 43, and the limiting plate 41 is connected to the annular plate 43. The annular plate 43 is designed to be annular to adapt to the shape and size of the insulation component 200. This design can ensure that the annular plate 43 can match the outer contour of the insulation component 200, and provide a stable foundation for the installation of the limiting plate 41. The limiting plate 41 is connected to the annular plate 43 by welding, bolting or other reliable connection methods. The support seat 42 raises the annular plate 43 and the limiting plate 41 as a whole, which is suitable for the limiting plate 41 to cooperate with the limiting groove 21 of the first mounting part 10. Avoid the axial dimension of the limiting plate 41 being too large to affect the structural strength of the limiting plate 41, so that the limiting plate 41 has sufficient strength and rigidity to withstand the weight and pressure of the insulation component 200.

[0097] The support base 42 may include a plurality of legs 421, one end of each leg 421 is connected to the adjustment support section 422, and the other end is connected to the annular plate 43. The adjustment support end may be connected to the embedded plate embedded in the bottom of the pit 300, or the adjustment support end may be fixed to the bottom of the pit 300 by an expansion bolt, which is not limited in the present application. The support base 42 also includes a reinforcing rod 423 connecting two adjacent legs 421 to improve the overall strength of the support base 42.

[0098] Between the legs 421 and the adjustment support section 422, spacers of different thicknesses may be provided to achieve precise adjustment of the levelness of the annular plate 43. This design ensures that the annular plate 43 always remains horizontal during installation, avoiding installation problems caused by tilt or unevenness.

[0099] In order to adapt to the axial thermal expansion of the heat preservation assembly 200 when it is in working state, when the heat preservation assembly 200 is in working state, the second mounting portion 20 can move relative to the second support member 40 along the axial direction of the heat preservation assembly 200 until the second mounting portion 20 abuts against the second support member 40. That is, when the heat preservation assembly 200 is in the installed state, the first mounting portion 10 and the first support member 30 cooperate to support the heat preservation assembly 200, and the second mounting portion 20 and the second support member 40 only provide circumferential limiting and centering functions. When the heat preservation assembly 200 is in working state, as the axial thermal expansion of the heat preservation assembly 200 increases, at first, the first mounting portion 10 and the first support member 30 cooperate to support, and the second mounting portion 20 approaches the second support member 40; at the critical point, the first mounting portion 10 cooperates with the first support member 30, and the second mounting portion 20 and the second support member 40 cooperate to support together; thereafter, the second mounting portion 20 and the second support member 40 cooperate to support, and the first mounting portion 10 moves away from the bearing plane 31 until the first mounting portion 10 abuts against the first limit portion 361. Between the installation state and the working state, the support structure realizes the conversion from the first mounting portion 10 and the first support member 30 to the second mounting portion 20 and the second support member 40. This conversion ensures that the heat preservation assembly 200 can be properly supported and fixed in different states.

[0100] Furthermore, in earthquake conditions, accident conditions, or when the cooperation between the first mounting portion 10 and the first support member 30 fails, the second mounting portion 20 and the second support member 40 can cooperate to provide support to ensure safe operation.

[0101] like Fig.10 As shown, the limiting plate 41 may be a T-shaped structure, that is, the limiting plate 41 includes a vertically connected horizontal plate 411 and a vertical plate 412, the horizontal plate 411 is connected to the annular plate 43, and the vertical plate 412 is used to extend into the limiting groove 21. When the heat preservation assembly 200 is in the installed state, there is a gap between the end of the vertical plate 412 away from the horizontal plate 411 and the bottom wall of the limiting groove 21; when the heat preservation assembly 200 is in the working state, the end of the vertical plate 412 away from the horizontal plate 411 can contact or abut the bottom wall of the limiting groove 21.

[0102] In other embodiments, when the insulation component 200 is in the installed state, the gap between the end of the vertical plate 412 away from the horizontal plate 411 and the limiting groove 21 is greater than the distance between the bottom of the second limiting portion 362 and the horizontal plate 411, so that when the insulation component 200 is in the working state, the bottom of the second limiting portion 362 can contact or abut the horizontal plate 411, and this embodiment does not limit this.

[0103] The second mounting portion 20 is arranged at the bottom of the insulation component 200, and the second mounting portion 20 has a limiting groove 21 extending radially along the insulation component 200; the second support member 40 includes a limiting plate 41, and the first end of the limiting plate 41 is inserted into the limiting groove 21; when the insulation component 200 is in the installed state, there is a gap between the first end of the limiting plate 41 and the bottom wall of the limiting groove 21; when the insulation component 200 is in the working state, the first end of the limiting plate 41 abuts against the bottom wall of the limiting groove 21 to support the insulation component 200.

[0104] like Figure 1 and Fig.11 As shown, the first mounting portion 10 and the first support member 30 jointly form a plurality of support points in the circumferential direction of the insulation component 200. These support points ensure that the insulation component 200 is subjected to uniform force in the circumferential direction, and avoid deformation or damage caused by excessive force on a single point. In order to avoid interference with structures such as the RPV (Reactor Pressure Vessel, reactor pressure vessel 400) support, RPV inlet and outlet pipes, and DVI (Direct Vessel Injection, direct injection system) pipes, the support points formed by the first mounting portion 10 and the first support member 30 are arranged in the gap between any two adjacent structures among these structures. This layout method not only ensures the effectiveness of the support points, but also avoids installation difficulties or operational failures caused by interference.

[0105] There are multiple first support members 30, which are arranged at intervals along the circumference of the thermal insulation component 200. This distribution ensures that the thermal insulation component 200 is evenly supported in the circumferential direction, thereby improving its overall rigidity and stability. Fig.11 As shown, the first mounting portion 10 and the first support member 30 form 6 support points, and the above 6 support points are evenly spaced along the axial direction of the thermal insulation component 200, and the number of the second support members 40 is consistent with the first support members 30, and they are aligned along the axial direction of the thermal insulation component 200. This means that each first support member 30 has a corresponding second support member 40 in the axial direction, and together they form a three-dimensional support network of the thermal insulation component 200. This alignment arrangement helps to maintain the stability and consistency of the thermal insulation component 200 in the axial direction.

[0106] In a second aspect, the present invention further provides a pile pit water injection system. In some embodiments, Figure 1 As shown, the reactor pit water injection system 1000 includes a reactor pit 300, a support ring 500 and the above-mentioned insulation structure of the reactor pressure vessel, the support ring 500 is arranged outside the reactor pit 300, the first support member 30 is connected to the support ring 500, and the second support member 40 is arranged in the reactor pit 300. The reactor pit water injection system 1000 in the present invention has the same technical effects as the insulation structure 100 in the above-mentioned embodiments, and will not be repeated here.

[0107] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A thermal insulation structure for a reactor pressure vessel, characterized in that: include: A thermal insulation assembly having a thermal insulation cavity for accommodating a reactor pressure vessel; The thermal insulation component is provided with a first mounting portion and a second mounting portion; A first support member, adapted to be connected to a support ring provided at the periphery of the stacking pit, the first support member being configured to bear the first mounting portion when the heat preservation assembly extends into the stacking pit along a preset direction; The second support member is suitable for being arranged in the stacking pit. The second support member is configured to center the insulation component when the insulation component extends into the stacking pit along a preset direction, and to limit the second mounting portion along the circumference of the insulation component.

2. The thermal insulation structure of the reactor pressure vessel according to claim 1, characterized in that: The bottom of the first mounting portion forms a first plane; The first support member has a bearing plane, and when the heat preservation assembly extends into the stacking pit, the bearing plane contacts the first plane to support the heat preservation assembly.

3. The thermal insulation structure of the reactor pressure vessel according to claim 2, characterized in that: Also includes an adjustment member; The first mounting portion is provided with a threaded hole, and the adjusting member is threadedly connected to the threaded hole; the adjusting member can be rotated relative to the first mounting portion until it is pressed against the supporting ring so that a gap exists between the first plane and the bearing plane.

4. The thermal insulation structure of the reactor pressure vessel according to claim 3, characterized in that: The first support member has a guide groove extending in the radial direction of the heat preservation assembly, and the adjustment member passes through the guide groove; When there is a gap between the first plane and the bearing plane, the first support member can move in the radial direction of the heat preservation component.

5. The thermal insulation structure of the reactor pressure vessel according to claim 1, characterized in that: One of the second mounting portion and the second supporting member forms a limiting groove extending in the radial direction of the heat preservation component, and the other includes a limiting plate inserted into the limiting groove.

6. The thermal insulation structure of the reactor pressure vessel according to claim 5, characterized in that: The second mounting portion is provided with a plurality of the limiting grooves arranged at intervals along the circumference of the heat preservation component; The second support member includes a plurality of limiting plates, the number of the limiting plates is consistent with the number of the limiting grooves, and the limiting plates are inserted into the limiting grooves in a one-to-one correspondence.

7. The thermal insulation structure of the reactor pressure vessel according to claim 5, characterized in that: The second support member further comprises a support seat, one end of which is used to be connected to the bottom wall of the pit, and the other end of which is provided with an annular plate; The annular plate has the limiting groove; or the limiting plate is connected to the annular plate.

8. The thermal insulation structure of a reactor pressure vessel according to any one of claims 1 to 7, characterized in that: The heat preservation component has an installation state and a working state. When the heat preservation component is in the installation state, the first installation portion is in surface contact with the first support member; When the heat preservation component is in working state, the first mounting portion can move relative to the second mounting portion along the radial direction of the heat preservation component to adapt to the radial thermal expansion of the heat preservation component.

9. The thermal insulation structure of the reactor pressure vessel according to claim 8, characterized in that: The first support member has a mounting groove extending in the radial direction of the heat preservation component, a portion of the first mounting portion is disposed in the mounting groove, and the first mounting portion is circumferentially limited between two side walls of the mounting groove; The bottom surface of the first mounting portion contacts the bottom wall of the mounting groove, and the first mounting portion can move in the mounting groove along the radial direction of the heat preservation component to adapt to the radial thermal expansion of the heat preservation component.

10. The thermal insulation structure of the reactor pressure vessel according to claim 9, characterized in that: The first support member includes a backing plate and a cover plate, the backing plate is provided with the mounting groove, and the cover plate is detachably connected to the backing plate; The cover plate has a first limiting portion, the first limiting portion is located at the notch of the mounting groove, and a portion of the first mounting portion is limited between the first limiting portion and the bottom wall of the mounting groove; and / or, The cover plate has a second limiting portion, which is arranged at one end of the installation slot facing the heat preservation component. When the heat preservation component is in the installation state, the second limiting portion stops the first installation portion.

11. The thermal insulation structure of the reactor pressure vessel according to claim 9, characterized in that: The first mounting portion includes a bottom plate and a rib plate, wherein the rib plate connects the top surface of the bottom plate and the side wall of the thermal insulation component; the bottom plate is arranged in the mounting groove, and the bottom surface of the bottom plate contacts the bottom wall of the mounting groove.

12. The thermal insulation structure of a reactor pressure vessel according to any one of claims 1 to 7, characterized in that: The second mounting portion cooperates with the slot of the second support member; when the insulation component is in working state, the second mounting portion can move axially relative to the second support member along the insulation component until the second mounting portion abuts against the second support member to adapt to the axial thermal expansion of the insulation component.

13. The thermal insulation structure of the reactor pressure vessel according to claim 12, characterized in that: The second mounting portion is arranged at the bottom of the heat preservation component, and the second mounting portion has a limiting groove extending in the radial direction of the heat preservation component; The second support member comprises a limiting plate, and a first end of the limiting plate is inserted into the limiting groove; When the heat preservation assembly is in the installed state, there is a gap between the first end of the limiting plate and the bottom wall of the limiting groove; When the heat preservation component is in working state, the first end of the limiting plate abuts against the bottom wall of the limiting groove to support the heat preservation component.

14. The thermal insulation structure of a reactor pressure vessel according to any one of claims 1 to 7, characterized in that: The number of the first support members is the same as the number of the second support members, and the first support members and the second support members are aligned along the axial direction of the heat preservation component.

15. The thermal insulation structure of a reactor pressure vessel according to any one of claims 1 to 7, characterized in that: The heat-insulating assembly comprises a flow guide tube and a heat-insulating layer arranged outside the flow guide tube, and the first mounting portion and the second mounting portion are both connected to the flow guide tube.

16. A pile pit water injection system, characterized in that: It includes a reactor pit, a support ring, and an insulation structure of a reactor pressure vessel as described in any one of 1 to 15, wherein the support ring is arranged on the outside of the reactor pit, the first support member is connected to the support ring, and the second support member is arranged in the reactor pit.

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